<template>
	<div class="app-container">

		<div>
			<filenameoption v-model="filename"></filenameoption>
			<autowidthoption v-model="autoWidth"></autowidthoption>
			<booktypeoption v-model="bookType"></booktypeoption>
			<el-button :loading="downloadLoading" style="margin:0 0 20px 20px;" type="primary" icon="el-icon-document" @click="handleDownload">
				Export Excel
			</el-button>
			<a href="https://panjiachen.github.io/vue-element-admin-site/feature/component/excel.html" target="_blank" style="margin-left:15px;">
				<el-tag type="info">Documentation</el-tag>
			</a>
		</div>

		<el-table v-loading="listLoading" :data="list" element-loading-text="拼命加载中" border fit highlight-current-row>
			<el-table-column align="center" label="Id" width="95">
				<template slot-scope="scope">
					{{ scope.$index }}
				</template>
			</el-table-column>
			<el-table-column label="Title">
				<template slot-scope="scope">
					{{ scope.row.title }}
				</template>
			</el-table-column>
			<el-table-column label="Author" width="110" align="center">
				<template slot-scope="scope">
					<el-tag>{{ scope.row.author }}</el-tag>
				</template>
			</el-table-column>
			<el-table-column label="Readings" width="115" align="center">
				<template slot-scope="scope">
					{{ scope.row.pageviews }}
				</template>
			</el-table-column>
			<el-table-column align="center" label="Date" width="220">
				<template slot-scope="scope">
					<i class="el-icon-time"></i>
					<span>{{ scope.row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
				</template>
			</el-table-column>
		</el-table>
	</div>
</template>

<script>
	const l = httpVueLoader;
	import * as UtilsObj from "/vue/utils/index.js";
	const parseTime = UtilsObj.parseTime;
	import { fetchList } from '/vue/api/article.js';
    import * as excel from '/vue/vendor/Export2Excel.js';
	// options components
    const FilenameOption = l('/vue/views/excel/components/FilenameOption.vue');
    const AutoWidthOption = l('/vue/views/excel/components/AutoWidthOption.vue');
    const BookTypeOption = l('/vue/views/excel/components/BookTypeOption.vue');

	module.exports = {
		name: 'ExportExcel',
		components: {
			"filenameoption": FilenameOption, "autowidthoption": AutoWidthOption, "booktypeoption": BookTypeOption
		},
		data() {
			return {
				list: null,
				listLoading: true,
				downloadLoading: false,
				filename: '',
				autoWidth: true,
				bookType: 'xlsx'
			}
		},
		created() {
			this.fetchData();
		},
		methods: {
			fetchData() {
				this.listLoading = true
				fetchList().then(response => {
					this.list = response.data.items
					this.listLoading = false
				})
			},
			handleDownload() {
				this.downloadLoading = true
					const tHeader = ['Id', 'Title', 'Author', 'Readings', 'Date']
					const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
					const list = this.list
					const data = this.formatJson(filterVal, list)
					excel.export_json_to_excel({
						header: tHeader,
						data,
						filename: this.filename,
						autoWidth: this.autoWidth,
						bookType: this.bookType
					})
					this.downloadLoading = false
			},
			formatJson(filterVal, jsonData) {
				return jsonData.map(v => filterVal.map(j => {
					if (j === 'timestamp') {
						return parseTime(v[j])
					} else {
						return v[j]
					}
				}))
			}
		}
	}
</script>

<style>
	.radio-label {
		font-size: 14px;
		color: #606266;
		line-height: 40px;
		padding: 0 12px 0 30px;
	}
</style>
